Piano-action.



PATENTED MAR. 12

J. AMMON. PIANO AGTION.

APPLIGATION FILED JUNE 28, 1906- I INVENTOR 70k 77/ d vz/m an ATTORNEYSUNITED STATES a'rnn'r ornicn.

JOHN AMMON, or NEW YORK, N. Y.

PIANO ACTION.

Specification of Letters Patent. lfatented March 12, 1907.

Application filed June 28,1906- tl' fil N0: 323,819.

T0 at who/1t it may concern:

Be it known that I, JOHN AMMON, a citizen of the United States, and aresident of the city of New York, borough of Manhattan, in the countyand State of New York, have invented a new and Improved. Piano-Action,of which the following is a full, clear, and exact description.

The invention relates to upright pianos; and its object is to providenew and improved. piano-action, arranged to simplify the action bydispensing with the bridle and bridle-wires, and at the same timeinsuring a proper return movement of the hammers without danger ofsticking of the coacting parts, and to cause a quick response of thehammers according to the touch on the keys.

The invention consists of novel features and parts and combinations ofthe same, which will be more fully described hereinafter and thenpointed out in the claims.

A practical embodiment of the invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure 1 is a cross-section of the improvement, showing the action atrest. Fig. 2 is a like view of the same, showing a key pressed and thehammer in action and Fig. 3 is a sectional side elevation of the butt ofthe ham- .mer, showing more particularly the adjustment of theback-stop.

The key A of the piano-action is provided with a capstan B, engaging thelower end of the thrust-rod (J, pivotally connected with the wippen D,on which is pivoted the lower end of the jack E, engaging the hammerbuttF of the hammer F for sounding the string G. The hammer-butt F isprovided with a bearing F for slidingly receiving one end of an angularor L shaped back-check H, preferably in the form of a wire terminatingat its depending member in a spoon H, adapted to be engaged by the feltt on the jack E to limit the movement of the same and the throw of thehammer F. The backv check His adjustably secured in the hammerbutt F bya set-screw H which when loosened allows adjustment of the backcheck Hto bring the spoon H in proper relation to the felt E on the jack E. Onthe bottom of the hammer-butt F is secured a pull-b ack 1, preferably inthe form of a wire having a forwardly-bent member 1, adapted to beengaged by a felted shoulder E formed 011 the jack E, so that when thekey A is released and the thrust-rod C moves downward then the shoulderE engages and exerts a downward pressure on the pull-back I to swing thehammer F back to the position of rest against the usual hammer-rail J.The pullback I is adjustably secured in the hammerbutt F by a set-screwF employed for securing the cap F of the hammer-butt bearing in place.

By the arrangement described a return movement of the hammer F isinsured without the use of a bridle and bridle-wire heretofore mainlyused, and the device for accomplishing the result is very simple anddurable in construction and is not liable to get so easily out of orderas the bridle and bridlewire heretofore used. The back-check arrangementshown and described is also simplified over that of the ordinaryconstruction now used, and it is evident that when the key A is pressedand the hammer F is thrown forward then the felt E finally moves incontact with the spoon H at the time the hammer F is in contact with thestring, so that a proper yielding backcheck is provided as the spoon Hand the felt E come together.

Having thus described my invention, 1 claim as new and desire to secureby Letters Patent 1. In a piano-action, the hammer provided with a butt,a bearing therein, a cap over said bearing and the set-screw forattaching the cap to the bearing, the ack for engaging the butt andprovided with a shoulder, the Wippen to which the jack is pivoted saidbutt having openings in the front and the bottom thereof, a backcheckcomprising a portion received in the front opening of the butt and anangular portion terminating in a spoon which engages the front of thejack, a set screw traversing the butt and engaging the backcheck wherebyto secure it in place, and a pull-back received in the bottom opening ofthe butt and retained in place by the setscrew of the cap, saidpull-back having a forwardly-projecting portion for engaging beneath theshoulder of the jack.

2. In a piano-action, a hammer, a jack for engaging the butt of thehammer, said jack being provided with a shoulder, the wippen to whichthe jack is pivoted, said butt having openings in the front and thebottom thereof, a backcheck comprising a portion received in the frontopening of the butt and an angular portion terminating in a spoon whichen IIO gages the front of the nek, a set-serew trawersil'ig the butt andengaging the backl cheek whereby to secure it 111 piiLCL, and apull-backreceived in the bottom opening,

and means for securing said. pull-bank in.

piaeefsaid. pull-back having a forward ly-pro- JOCtlllg portion forcngaglng heneath the shoulder of the 12L0k.

E in testimony whereof l have signed my two subscribing Witnesses.

J )HN AM M ON.

\Vitnesses TnEo. G. lilOS'lER, i EVERARD B. MARSHALL.

name to this specification .in the presence of i0

